객관식
Which term describes the region surrounding the nucleus where electrons are most likely to be found?
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- 1. Intro to General Chemistry3h 46m
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2. Atoms & Elements
The Atom
Multiple Choice
What is the mass number of an atom that contains 5 protons and 7 neutrons?
A
2
B
7
C
5
D
12
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검증된 단계별 안내1
Identify the number of protons in the atom, which is given as 5. The number of protons defines the atomic number.
Identify the number of neutrons in the atom, which is given as 7.
Recall that the mass number of an atom is the sum of the number of protons and neutrons in its nucleus.
Write the formula for the mass number: \(\text{Mass Number} = \text{Number of Protons} + \text{Number of Neutrons}\).
Substitute the given values into the formula: \(\text{Mass Number} = 5 + 7\).
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